Alec Brenner on When Tectonic Plates First Moved

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Recorded30 Apr 2026

Publisheranchor.fm ↗

Handlerec:18197250

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A key development in the history of the early Earth is the formation of lithospheric plates that move independently of one another. In this episode, Brenner describes how he used paleomagnetic methods to detect relative motion between two ancient cratons, the East Pilbara and the Kaapvaal, 3.5 billion years ago. This is a full billion years earlier than any previous such detection, and it enables us to narrow down the kind of tectonics operating in the Paleoarchean. Of the candidate regimes, episodic subduction models fit his data best. Brenner is a Postdoctoral Associate in the Department of Earth & Planetary Science at Yale University.

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